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j <br /> f ' <br /> 1 ` <br /> i <br /> t <br /> Table 1. Water-Level Elevations for <br /> 0 <br /> f' ARCO Facility 2093, Tracy, California <br /> i <br /> Top-of-casing Depth-to- Floating Water-level Change since <br /> Well number elevation, water, product thickness. elevation, last measurement, <br /> and date in feet(a) in feet in feet in feet(b) in feet <br /> 10/26/95 (d) 13.03 -- -0.03 <br /> 2/12/96 12.00 -- 1.03 <br /> 4/18/96 12.58 -- -0.58 <br /> TEX-1 (d) A- <br /> 10/26/95 12.86 -- -- <br /> 2/12/96 - 10.90 �, -- 196 <br /> 4118/96 11.35 -- -0.45 <br /> ,(a)All elevations have been corrected to an arbitrary datum based on a <br /> temporary on-site benchmark with an assigned elevation of 50 feet. <br /> (b) Corrected water level elevation value(Wlc=Wlm+(b)(p)),'where Wlc=water-Ievel <br /> elevation corrected, Wlm=water-level elevation measured,b--hydrocarbon thickness (feet), <br /> p=specific gravity(0.7)of hydrocarbon. j <br /> (c) Well could not be located due to parking lot repaving. <br /> (d)Top of well casing altered. Well casing has not been resurveyed. Water-level measured <br /> from the highest point of well casing. + <br /> {e)Depth-to-water for these dates reported incorrectly in quarterly reports <br /> for October 1990 through July 1991. <br /> (f)Well was inaccessible due to on-site construction activities. <br /> -(g)Unable to open well box lid. <br /> (h)Water level data collected this date probably not representative of groundwater conditions. <br /> i <br /> NOTE:The water level elevations in this report cannot be comipared with any reports <br /> prior to March 1991 due to the correction to the arbitrary datum. However, these <br /> corrections should not change any previous contour maps. ., <br /> i' <br /> i� <br /> 'J <br /> I- 33 L5ITABLES12093)UN6.XLS <br /> :i <br />